#include<stdio.h>
int main()
{


    int year,month;
    int day;

        scanf("%d%d",&year,&month);
        switch(month)
        {
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            day=31;
            break;
        case 4:
        case 6:
        case 9:
        case 11:
            day=30;
            break;
        case 2:
            if(year%4==0&&year%100!=0|| year%400==0)
            {

                day=29;
            }
            else
            {

                day=28;
            }
            break;
        default:
            day=-1;
            break;
        }

        if(day>0)
            printf("%d\n",day);
        else
            puts("Are you kidding?");

    return 0;

}
